How severe is CVE-2025-54353?

CVE-2025-54353 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-54353 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-54353?

CVE-2025-54353 affects Fortinet Fortisandbox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-54353?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-54353 have an EU (EUVD) identifier?

Yes. CVE-2025-54353 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202269.

When was CVE-2025-54353 published?

CVE-2025-54353 was published on 2025-12-09 and last updated on 2026-06-17.

CVE-2025-54353

CVE-2025-54353 is a medium-severity vulnerability in Fortinet Fortisandbox with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-202269
Weakness: CWE-79
Affected product: Fortinet Fortisandbox
Published: 2025-12-09
Last modified: 2026-06-17

Description

An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability [CWE-79] vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.2, FortiSandbox 4.4.0 through 4.4.7, FortiSandbox 4.2 all versions, FortiSandbox 4.0 all versions may allow an attacker to perform an XSS attack via crafted HTTP requests.

Frequently asked questions

What is CVE-2025-54353?: An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability [CWE-79] vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.2, FortiSandbox 4.4.0 through 4.4.7, FortiSandbox 4.2 all versions, FortiSandbox 4.0 all versions may allow an attacker to perform an XSS attack via crafted HTTP requests.
How severe is CVE-2025-54353?: CVE-2025-54353 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-54353 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-54353?: CVE-2025-54353 affects Fortinet Fortisandbox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-54353?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-54353 have an EU (EUVD) identifier?: Yes. CVE-2025-54353 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-202269.
When was CVE-2025-54353 published?: CVE-2025-54353 was published on 2025-12-09 and last updated on 2026-06-17.

References

https://fortiguard.fortinet.com/psirt/FG-IR-25-477

Affected products (1)

cpe:2.3:a:fortinet:fortisandbox:*:*:*:*:*:*:*:*

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